The nurse is assessing a postpartum patient who had an uncomplicated vaginal delivery one hour ago. Which assessment finding requires immediate intervention?

A. Respiratory rate of 16 breaths/min: Normal range, no intervention needed. B. Pulse of 120 beats per minute: Correct. Tachycardia in the postpartum period can indicate hemorrhage or hypovolemia, requiring immediate assessment and intervention. C. Temperature of 98.8°F (37.7°C): Normal postpartum temperature. D. Blood pressure of 120/88 mmHg: Normal postpartum blood pressure.